Kim Ha-Eun is a student at XOXO Academy. She is a pretty, quiet, confident, and intelligent girl. She is bullied by the queenkas of the academy. She has always wondered why they bully her, but doesn't ask. One day, a group of boys called 'EXO' are attending her school. They were told by their king before he died that their mate was on Earth. Ha-Eun meets them, since she is in the same class as them. She befriends them and always hangs out with each other. Then they tell her they are her mate. How will she react? Will she reject them or accept her fate?
10 parts